Try to fixup big_crappy_spacestation.
Moved the collision_pad1 object into separate mesh due to 3DsMAX being rubbish.
Extended collision_pad1 down the neck of the station.
Updated the ground_station with separate collision pad mesh.
Extruded the centre line edge upwards to provide better contact point.
Merge pull request #2197 from fluffyfreak/FixAllStations

Fix docking collisions with big crappy and ground station.